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https://issues.apache.org/jira/browse/SOLR-3580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13403641#comment-13403641
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Michael Dodsworth commented on SOLR-3580:
-----------------------------------------

one option (that sits somewhere between the 2 proposed solutions) may be to 
have a 'supportedLowercaseOperators' setting that takes a comma-separated list 
of supported operators. If no override is provided, the default behaviour would 
be to accept '[and,or]'.

{code:xml} 
<str name="supportedLowercaseOperators">and,or,not</str>
{code}

Let me get a patch together so people can take a look.
                
> In ExtendedDismax, lowercase 'not' operator is not being treated as an 
> operator when 'lowercaseOperators' is enabled
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-3580
>                 URL: https://issues.apache.org/jira/browse/SOLR-3580
>             Project: Solr
>          Issue Type: Bug
>          Components: query parsers
>    Affects Versions: 4.0
>            Reporter: Michael Dodsworth
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: SOLR-3580.patch
>
>
> When lowercase operator support is enabled (for edismax), the lowercase 'not' 
> operator is being wrongly treated as a literal term (and not as an operator).

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